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Common instances where the term "value" is used in mathematics are when discussing the mean value, or average, of a set of data and the value of a function at a certain point. For instance, the expression 3+3 has a value of 6, and the function f(x)=x+2 has the value 3 at f(1). In other subjects and industries, including real estate and finance, an item's value refers to its worth.